Waugh, T. (2005). Power up your profits: 31 days to better selling (2nd ed.). Hoboken, N.J.: John Wiley & Sons.
Παραπομπή Chicago StyleWaugh, Troy. Power Up Your Profits: 31 Days to Better Selling. 2nd ed. Hoboken, N.J.: John Wiley & Sons, 2005.
Παραπομπή MLAWaugh, Troy. Power Up Your Profits: 31 Days to Better Selling. 2nd ed. Hoboken, N.J.: John Wiley & Sons, 2005.
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